2. Density refers to how much stuff (mass) there is in a given volume. Density= mass/volume

3. Density tells us how tightly matter is packed together If something is packed very tightly together it’s considered to be dense. More dense sinks and pushes up less dense!

4. A way to describe two substances (rock, water, warm air, cool air) to see which weighs more compared to the same amount of the other. In other words, does a bucket of lead weigh more or less than a bucket of popcorn???

5. Weight vs Mass Difference?? Your weight ______ Multiply by.17 for weight on the moon Now multiply by 2.5 for weight on Jupiter

6. Scientists believe Earth got it’s layers because shortly after it formed there was a great deal of heat, causing Earth to melt into semi-solid liquid. More dense materials settle toward the center. (Core) Less dense materials rose toward the surface. (Crust)

7. Today aluminum and silicon, which have low densities, are common in Earth’s crust. Earth’s inner and outer cores are composed mostly of very dense iron.

8. The oceanic crust is made mostly of basalt. The continental crust is made mostly of andesite and granite.

9. Heating the lower mantle causes the material to expand. Since less dense materials float on more dense materials, a convection current develops.